<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
	/* 普通的、未被访问的链接 */
	a:LINK{
		color:red;
		text-decoration: none;
	}
	/* 用户已访问过的链接 */
	a:VISITED {
		color:yellow;
		text-decoration: none;
	}
	/* 鼠标指针位于链接的上方 */
	a:HOVER {
		background-color: blue;
		text-decoration: none;
	}
</style>
</head>
<body>
<a href="https://www.baidu.com">百度</a>
</body>
</html>